If he prays ‘Isha’ with Maghrib at the time of Maghrib, he can pray Witr immediately after that.
If I join Maghrib and ‘Isha’ at the time of Maghrib because of traveling, when should I pray Witr? Should I pray it straight after ‘Isha’ or wait until the time for ‘Isha’ begins?.
Praise be to Allaah.
You can pray it straight after praying ‘Isha’.
It says in Fataawa al-Lajnah al-Daa’imah (8/144):
It is prescribed for
travellers and those who are sick to join prayers, and also for
non-travellers to join prayers on a rainy night. They may then pray Witr
immediately after praying ‘Isha’ when it is joined to Maghrib at the time of
Maghrib.